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facet fuel pumps

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Yak52(at)aol.com
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Posted: Sun May 06, 2007 7:18 am Post subject: facet fuel pumps

I have installed two facet 40108 pumps in series on the floor in front of  the gascolator in a 601xl. The line then goes through the firewall to the  carburetor on a continental 0200a. There is no pressure regulator except the  pumps themselves. The fuel pressure indicator is at the carb. Upon starting, the  fuel pressure using   one pump goes to 4 pounds, but at cruise rpm's  the pressure goes to 1 pound. Adding the second pump raises the pressure at  cruise to 7 pounds, but floods out the carb if rpm's are lowered to pattern  power settings.  I am at a loss to explain, but searched the archives and  noticed that others have had low pressure problems with the facet cube pumps  upon occasion. Is the installation in series the problem? Are the pumps not of  sufficient volume? Should I go to  the traditional piper style 480545 facet  interrupter pumps? There is no mechanical fuel pump on this engine as it was  taken from a cessna 150.

 Yak52(at)aol.com (Yak52(at)aol.com)



See what's free at AOL.com. 

  [quote][b]

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p.mulwitz(at)worldnet.att
Guest

Posted: Sun May 06, 2007 9:01 am Post subject: facet fuel pumps

One problem you certainly have with this setup is loss of electrical power will kill the engine.  Since you have a  low wing, fuel will not get to the engine if power is removed from the electric pumps.  That is why it is customary to use a combination of electric and mechanical pumps on an airplane.



 It seems prudent to add a mechanical pump to this installation.



 Paul

 XL fuselage



 At 08:16 AM 5/6/2007, you wrote:

 [quote]I have installed two facet 40108 pumps in series on the floor in front of the gascolator in a 601xl. The line then goes through the firewall to the carburetor on a continental 0200a. There is no pressure regulator except the pumps themselves. The fuel pressure indicator is at the carb. Upon starting, the fuel pressure using   one pump goes to 4 pounds, but at cruise rpm's the pressure goes to 1 pound. Adding the second pump raises the pressure at cruise to 7 pounds, but floods out the carb if rpm's are lowered to pattern power settings.  I am at a loss to explain, but searched the archives and noticed that others have had low pressure problems with the facet cube pumps upon occasion. Is the installation in series the problem? Are the pumps not of sufficient volume? Should I go to  the traditional piper style 480545 facet interrupter pumps? There is no mechanical fuel pump on this engine as it was taken from a cessna 150.

 Yak52(at)aol.com (Yak52(at)aol.com)

 

 [b]

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Martin Pohl

Joined: 30 Jan 2006
Posts: 118
Location: CH-8645 Jona SG, Switzerland

Posted: Sun May 06, 2007 10:14 am Post subject: Re: facet fuel pumps

The pressure should double for two fuel pumps in serie. According to an email answer of info(at)facet-pumpen.de it is important that you keep a distance of at least 40 cm (= 15 inch) between the two pumps.



I would always rely on a mechanical pump too!!!



Rgds

Martin

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_________________
Martin Pohl
Zodiac XL QBK
8645 Jona, Switzerland
http://www.pohltec.ch/ZodiacXL/Main.html

jetboy

Joined: 22 Jul 2006
Posts: 233

Posted: Sun May 06, 2007 9:39 pm Post subject: Re: facet fuel pumps

The 0-200 has a mount pad for mechanical pump for your application, so best practice is to fit one and use one electric pump as boost pump. its also possible to fit the electric pumps in parallel, with a non-return check valve in each outlet line, if the pumps dont alredy have this. But you need dual electric supply then.



Ralph,  ex - c150

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Ralph - CH701 / 2200a

s.c.richards(at)homecall.
Guest

Posted: Mon May 07, 2007 9:08 am Post subject: facet fuel pumps

Hi If you have a Marvel Carburettor for use with a  mechanical fuel pump I believe the Max inlet pressure is 6 psi. I believe I read  in the 0200 manual that a different carb inlet valve is used with gravity feed  due to lower pressure I assume you have this fitted if your carb is off a C152.  You may be able to confirm this by asking carb manufactures or looking in there  web site.

  Ray's  601 I fly has a facet 40106 rated  4-5.5 psi on fire wall as a backup in parallel with the engine driven pump the  feed is from header tank through gascolator to pumps.

 We donot have a pressure gage fitted so donot know  running pressures.

  We topup the header tank from wing tanks with  a facet  40105 pump supplied with kit.  There will be a lot of  information on fuel systems in the archives.

  

 do no archive

  

   Clive Richards

  

 Ray Lasnier 601HD Continental 0200  110 Hours  todate



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